LSkewUrb: Urban adjustment for the linear skewness (LSkew)

In UKFE: UK Flood Estimation

Urban adjustment for the linear skewness (LSkew)

Description

Urbanises or de-urbanises the LSkew using the methods outlined in the guidance by Wallingford HydroSolutions: 'WINFAP 4 Urban Adjustment Procedures'

Usage

LSkewUrb(lskew, URBEXT2000, DeUrb = FALSE)

Arguments

lskew	the LSkew (numeric)
URBEXT2000	quantiication of urban and suburbanisation for the subject site
DeUrb	logical argument with a default of FALSE. If set to TRUE, de-urbanisation adjustment is performed, if FALSE, urbanisation adjustment is performed

Details

The method for de-urbanisation isn't explicitly provided in 'WINFAP 4 Urban Adjustment Procedures', but the procedure is a re-arrangment of the urbanisation equation, solving for LSkew rather than LSkew-urban.

Value

The urban adjust Lcv or the de-urbanised Lcv

Author(s)

Anthony Hammond

Examples

#Choose an urban site (site 53006) from the NRFA data then apply a de-urban
#adjustment using the Lcv and URBEXT2000 displayed
NRFAData[which(rownames(NRFAData) == 53006),]
LSkewUrb(0.124, 0.1138, DeUrb = TRUE)
#Get the pooled Lmoment ratios results for catchment 53006 and apply the urban
#Get the CDS & adjustment using the pooled LSkew, and the URBEXT2000 for site 53006.
CDs.53006 <- GetCDs(53006)
QuickResults(CDs.53006)[[2]]
LSkewUrb(0.194, 0.1138)

UKFE documentation built on Nov. 6, 2023, 1:07 a.m.